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Scale-inhibition and flocculation dual-functionality of poly(acrylic acid) grafted starch

机译:聚丙烯酸接枝淀粉的阻垢絮凝双重功能

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摘要

Natural-polymer based water treatment agents have recently received much more attention due to their environmental friendliness, widespread availability, and prominent structural features. Starch-graft-poly(acrylic acid) (St-g-PAA) is a simple natural-polymer based material that can be obtained easily by a one-step graft copolymerization. When used as a water treatment agent, St-g-PAA exhibits both effective scale-inhibition performance and high turbidity removal efficiency. The scale-inhibition efficiency of St-g-PAA against calcium carbonate (CaCO_3) is approximately 94% at the optimal dose in a static test of approximately 40 mg/L Dispersion, crystal lattice distortion, and chelating effects all play important roles in the scale inhibition. When St-g-PAA is used as a coagulant aid for polyaluminum chloride (PAC) in the flocculation of a real hairwork wastewater, the highest reduction of the optimal PAC dose is more than 30% while the turbidity reduction is about 97% at the same time, both floe size and compactness increase, and the final settling efficiency also improves evidently. The efficient bridging flocculation effects account for the effective turbidity removal. The prominent scale-inhibition and flocculation dual-functionality of St-g-PAA is intrinsically ascribed to its distinct anionic linear branched-chain structure.
机译:基于天然聚合物的水处理剂由于其环境友好性,广泛的可获得性和突出的结构特征,最近受到了越来越多的关注。淀粉接枝聚丙烯酸(St-g-PAA)是一种简单的基于天然聚合物的材料,可以通过一步接枝共聚轻松获得。当用作水处理剂时,St-g-PAA既显示出有效的阻垢性能,又显示出高的除浊效率。在约40 mg / L的静态测试中,最佳剂量下,St-g-PAA对碳酸钙(CaCO_3)的阻垢效率约为94%。分散,晶格畸变和螯合作用均在碳酸钙中起重要作用。阻垢。当St-g-PAA用作絮凝剂用于实际发丝废水中的聚氯化铝(PAC)助凝剂时,最佳PAC剂量的最大减少量超过30%,而浊度降低率在97%左右。同时,絮凝物的尺寸和紧密度均增加,最终沉降效率也明显提高。有效的桥接絮凝作用可有效去除浊度。 St-g-PAA突出的阻垢和絮凝双重功能本质上归因于其独特的阴离子线性支链结构。

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